Many Mark III owners are completely fed-up with dis and then re-assembly of their pistols for a much needed, and routinely required, cleaning maintenance plan. What to do? The Ruger engineers inflicted a system into the Ruger Mark III that requires a real PITA to deal with during disassembly. The "magazine disconnect". These parts require that pulling the trigger requires that a magazine be inserted into the grip frame. Either empty or full, doesn't matter. So, during take-down, you need to verify that the chamber is empty of any live rounds, as is the magazine, to be SAFE, then you insert the empty magazine, point the pistol in a safe direction, then, and only then, will you be able to pull the trigger and send the hammer forward. Then, you need to remove the magazine so that the mainspring housing latch can be pulled down and the mainspring housing removed. Removing the upper from the grip frame will now be easily done. Enter, a very smart fella' who perfected the design of a replacement hammer bushing that takes the magazine disconnect parts out of play, and then the pistol will behave much more like the Ruger Mark II pistol does, for maintenance. Others came along and tried to copy his design, but from the get-go it was noticed that the copy-cats were oblivious as to what they were doing which reflected their firearms knowledge ignorance. Tandemkross did what they do best, copy someone's idea. This was their first "boondoggle" because they made their first attempt out of aluminum. They did sell a bunch of these to unsuspecting customers that trusted their sales pitch, but when the bushings began to wear quickly from dealing with "steel" mating parts, failure of those aluminum bushings came in droves. No, we never did read of a replacement or rebate program involved when they finally went to using "steel" for their bushing. Good customer service? Another feature those two had no clue about, hammer bushing bore size is not the same with every Ruger Mark III pistol hammer, the size varies, so many of their hammer bushings fit loosely and drifted from side to side over the hammer pivot pin, and some even wobbled. Didn't do much to maintain a consistent trigger pull. So, that's why I like to work with MY fabulous customers and see that they get a matched hammer to hammer bushing accomplishment, which they deserve for what they're spending: This is a combined assembly of a Ruger Mark III "speed-lock" hammer and a press fit hammer bushing that will replace the magazine disconnect parts for a Mark III pistol. The hammer has had all contact surfaces polished for smooth operation, and best of all, it's a "drop-in" part, so you can replace your original parts if your pistol ever needs to go back to Ruger. Send me an email or private message if you'd like to learn more.